期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 294, 期 1-2, 页码 8-13出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2008.07.003
关键词
Na-9[SbW9O33]; Polyoxometalates; Phase transfer catalyst; Alkenes; Epoxidation; Aqueous H2O2
资金
- University Grant Commission (UGC), New Delhi
- Council of Scientific and Industrial Research (CSIR), New Delhi
- Department of Science and Technology (DST), New Delhi
Na-9[SbW9O33] in conjunction with a phase transfer catalyst (methyl tricapryl ammonium chloride) is a highly efficient catalytic system for the selective epoxidation of alkenes with aqueous H2O2 as the oxidant. Importantly, the reactions can be carried out in the absence of any organic solvents. The alkene epoxidation reactions with both, a transition metal ion substituted polyoxotungstate as well as a transition metal ion free polyoxotungstate precursor indicates that the tungstate group is the active center for the oxidation reaction. It was also observed that the transition metal ion does not play any significant role in the reaction. IR studies support the formation of tungsten-peroxo species and also show that the catalyst is stable in the presence of phase transfer catalyst when aqueous H2O2 is used as an oxidant. (C) 2008 Elsevier B.V. All rights reserved.
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